Novel Dynamic Flux Chamber for Measuring Air–Surface Exchange of Hgo from Soils

	Novel Dynamic Flux Chamber for Measuring Air–Surface Exchange of Hgo from Soils
	Che-Jen Lin; Wei Zhu; Xianchang Li; Xinbin Feng; Jonas Sommar; Lihai Shang
	2012
发表期刊	Environmental Science & Technology
卷号	46 期号:16 页码:8910-8920
其他摘要	Quantifying the air-surface exchange of Hg-o from soils is critical to understanding the cycling of mercury in different environmental compartments. Dynamic flux chambers (DFCs) have been widely employed for Hg-o flux measurement over soils. However, DFCs of different sizes, shapes, and sampling flow rates yield distinct measured fluxes for a soil substrate under identical environmental conditions. In this study, we performed an integrated modeling, laboratory and field study to design a DFC capable of producing a steady and uniform air flow over a flat surface. The new DFC was fabricated using polycarbonate sheets. The internal velocity field was experimentally verified against model predictions using both theoretical and computational fluid dynamics techniques, suggesting fully developed flow with velocity profiles in excellent agreement with model results. Laboratory flux measurements demonstrated that the new design improves data reproducibility as compared to a conventional DFC, and reproduces the model-predicted flux trend with increasing sampling flow. A mathematical relationship between the sampling flow rate and surface friction velocity, a variable commonly parametrized in atmospheric models, was developed for field application. For the first time, the internal shear property of a DFC can be precisely controlled using the sampling flow rate, and the flux under atmospheric condition can be inferred from the measured flux and surface shear property. The demonstrated methodology potentially bridges the gap in measured fluxes obtained by the DFC method and the micrometeorological methods.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/4802
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文环境地球化学国家重点实验室
推荐引用方式 GB/T 7714	Che-Jen Lin,Wei Zhu,Xianchang Li,等. Novel Dynamic Flux Chamber for Measuring Air–Surface Exchange of Hgo from Soils[J]. Environmental Science & Technology,2012,46(16):8910-8920.
APA	Che-Jen Lin,Wei Zhu,Xianchang Li,Xinbin Feng,Jonas Sommar,&Lihai Shang.(2012).Novel Dynamic Flux Chamber for Measuring Air–Surface Exchange of Hgo from Soils.Environmental Science & Technology,46(16),8910-8920.
MLA	Che-Jen Lin,et al."Novel Dynamic Flux Chamber for Measuring Air–Surface Exchange of Hgo from Soils".Environmental Science & Technology 46.16(2012):8910-8920.

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